Electrical precipitating apparatus



March 3, 1931-. w 0ss 1,794,615

- ELECTRICAL PRECIPITATING APPARATUS Filed May 9, 1928 INV NTOR.

ATTO EYS..

Patented Mar. 3, 1931 UNITED STATES v PATEN'll OFFICE WILHELM HOSS, 0F FRANKFORT, GERMANY, ASSIGNOR T0 INTERNATIONAL PRECIPI- TATION COMPANY, OF I-OS AN GELES, CALIFORNIA, A CORPORATION OF CALIFORNIA ELECTRICAL PRECIPITATING APPARATUS Application filed May 9, 1928, Serial No.

This invention relates to apparatus for electrical precipitation of suspended particles from'gases and thechief object of the invention is to provide a simple type of construction for use in cases where a graded potential is to be employed in successive units or sections of the precipitating apparatus.

A particular object of the invention is to provide a construction whereby all of the sections are connected to a common source of electrical current and the gradation of potential in the successive sections is obtained by inserting resistances or impedances of different values in the lines leading to the different sections, and whereby the high tension or discharge electrode systems of all of the sections or at least of a plurality of sections are supported mechanically by a common supporting means or bus bar.

In certain cases of electrical precipitation it is desirable to pass the gases to be treated through successive electric fields of. varying strength or potential difference, for example, through fields of successively increasing potential. It has already been proposed in such cases to obtain the gradation of potential by inserting suitable resistances in theline's leading to the discharge electrode systems of the successive fields. The novelty of the present invention, therefore, consists chiefly in the supporting of the discharge electrode systems of a plurality of sections of such an electrical preclpitator upon a common supporting means or bus bar. This object is accomplished according to this invention by supporting all of the discharge electrode systems upon the common supporting means and providing suitable insulating means between the respective discharge. electrode systems and said supporting means so as to permit the desired diflerences of potential to be maintained.

The accompanying-drawing illustrates an embodiment of my invention and referring thereto,

Fig. 1 is a longitudinal section of the up er portion of an electrical precipitator em y- 111%171118 inventlon.

. ig. 2 is a transverse section on line 2.-2 m Fig. 1.

276,430, and in Germany May 28, 1927.

The electrical precipitator is shown as comprising a casing 1 in which are mounted three successive groups of discharge and collecting electrodes. The collecting electrodes of the successive groups or units are indicated at 2, 3 and 4, said collecting electrodes being supported in any suitable manner as by means of supporting bars 5. The discharge electrode systems of the successlve groups or units are indicated at 6, 7 and 8 respectlvely, each of said discharge electrode systems comprising a plurality of rows of discharge electrode members 10, such as fine wires or rods, hung between the respective collecting electrode. Said discharge electrode members may be hung from rods or pipes 12 which in turn are secured to transverse frame members 13. A yoke or other suitable member 14 is secured to the frame member or members 13 for the discharge electrode systems of each group or section.

The supportingyoke 14 for one group of discharge electrode, such as grou 8, rests directly upon the common supporting member or bus bar 16, while the supporting yokes for the other groups of dischar e electrodes winding may be connected by wires 27 to' opposite contact members of mechanical rectifier 28. One of the intermediate contact members of said rectifier may be grounded as at 29 and the collecting electrodes of all the units of the'precipitator may also begrounded as indicated at 30. Wire 32 leads from the main supporting bar 16 or from a metallic supportin member connected thereto, through msu ator 33 to the other inso that the maximum termediate contact of the rectifier, while wires 34 and 36 lead from the respective supporting yokes 14 for the discharge electrode groups 6 and 7, or from any other suitable part of the discharge electrode systems, through insulators 35 and 37 to said other contact member or to wire 32 as shown. Resistances 39 and 40 are, however, inserted in lines 34 and 36 respectively, the resistance 39 being shown as having a greater value than resistance 40. Resistance 39 may, for example, be twice as great as resistance 40.

It is evident from the above that the potential diflerence between discharge electrodes 6 and collecting electrodes 2 will be reduced by an amount equal to the potential drop in resistance 39, and the potential difference between discharge electrodes 7 and collecting electrodes 3 will be reduced by an amount equal to the otential drop in resistance 40, while the ull potential delivered by the electrical equipment will be maintained between discharge electrodes 8 and collecting electrodes 4. The insulatin supports 17 and 18 should, of course, be su cient to withstand the existing potential difference between the respective support-yokes 14 and the bus bar 16.

The gas to be treated may be passed in either direction through the precipitator, for example, the inlet flue may be at 45 and the .outlet flue at 46. In such case, the gas is subjected to electric fields of successively increasing strength in passing between the successive groups or sections of discharge and collecting electrodes.

In passing through these electric fields the suspended particles, such as dust, carried by the gas stream, become electrically charged and are precipitated u on the collecting electrodes whence they fa l to the bottom of the precipitator and may be removed in any suitable manner.

Thegradation of potential efiected in the above manner may, for example, be such as to provide for a potential diiference of 40,000 volts in the first section, 45,000 in the second section, and 50,000 volts in the third section, potential drop across insulator 17 would be 10,000 volts. The insulators 1'1 and 18 may advantageously be formed as plates or discs, and by inserting such insulating plates or discs between the discharge electrode systems and the common supporting means, for exam le as above described, it is possible to app y the invention to existing precipitating apparatus and provide for gradation of potential therein.

I claim: 1

1. An apparatus for electrical precipitation of suspended particles from gases comprising a pluralityof electrical precipitator units arranged for passage of as there through in series and each provide with 001- Y lecting electrodemeans and discharge electrode means, a common supporting means for'the discharge electrode means of all of said precipitator units, means electrically connecting said common supporting means to the high tension side of a source of current, separate means connecting the discharge electrode means of certain of said precipitator units to said high tension side 0 the source of current, resistances of different values in said last-named connecting means, and insulating means between said comm'on supporting means and the discharge electrode means which are connected through said resistances to said source of current.

2. In an electrical precipitating apparatus, a source of high tension current, two electrical precipitator units each comprising dischar e electrode means and collecting electro e means, a common supporting meansffor the discharge electrode. means of both of said units, means for connecting the discharge electrode means of one of said units directly to the high tension side of said source of current, said electrode means being mounted directly upon said common supporting means,

and means including resistance for connecting discharge electrode means of the other of said units to said high tension side of the source of current, said second-named electrode means being mounted on and insulated from said common supporting means.

In testimony whereof I have hereunto subscribed my name this 30th day of April 1928.

WILHELM HOSS. 

